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Questar Full Solar Filter (As-Is with Pinholes!) For Sale

Price - $175.00

Ad Number: 171082

Posted: 15 May 2019

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This is a heavily pin-holed Questar solar filter. Case not included. The machined cell is excellent. But the coating has had some abuse and has numerous pinholes that affect the image.

This provides a clear stunningly sharp solar image, but the larger pinholes create something like lens "flare" that overlays part of the image. As shown in one photo, I have spotted the bigger holes with a Sharpie - on the rear uncoated surface where they may easily be removed. I did this in a quick rush to verify that it cures the flare. On observing just now I found the image to be indistinguishable from a perfect full aperture Questar filter, and greatly superior to the off-axis filter - truly no comparison. I guarantee that with the clumsy markings that are not visible when the filter is in place (may be detectable on the defocused image), the results will be clearly superior to a perfect off-axis filter. I probably could have marked less than half of the holes and ignored the tiny ones as the factory advises they do not affect viewing. The buyer may wish to re-dot the filter.

Possible uses of this include:
  • Touch up with Sharpie to restore performance.
Alternatives that don't make sense now that I've verified performance when spotted:
  • Display item.
  • Replace* filter element with inexpensive non-Questar element.
  • Replace* filter element with clear element for optical protection.
*Filter element is retained by fiber synthetic retention ring removable by normal lens spanner.
Shipping adds $7.50 - Paypal adds 3%

General


  • Condition As-is
  • Location DFW Texas



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